Vane pump rotor



B3, B9. G. A. WALDIE ETAL 29428945 VANE PUMP ROTOR Filed Oct. 26. 1942 3 Sheets-Sheet l 4 l:r a

m: INVEN-I-ORS ezonaz awnmos, IDHRN A.'MULLER 22 BY j ATTORNEY-5 Sept. 13, W49. G. A. WALDIE ETAL 'VANE PUMP ROTOR 3 Sheets-Sheet 2 Filed Oct 26. 1942 INVENTOREI GEORGE AWALDIE, J'OHAN AMULLER, Y W 1' a ATTORNEYs Swm H3, W49. a. A. WMDEE m-AL ,VANE PUMP ROTOR Filed 00$. 26, 1942 3 Sheets-Sheet 3 INVENTORS GEORGE AWALDIE, nnqu A. MULLER;

Patented Sept. 13,1949

VANE PUMP ROTOR George A. Waldle, Edison, and Johan Ohio, assignors Dayton, ment Corporation,

A. Muller,

to H-P-M Developa corporation oi Delaware Application October 26, 1942, Serial No. 463,336 Claims. (01. 103-136) This invention relates to pump rotors and, in particular, to rotors for vane pumps.

Vane pumps, as heretofore known. substantially comprise a flow control member or slide block with a cylindrical bore movable selectively into or out of a position concentric to a cylindrical body forming a part of the pump rotor and being rotatable in the cylindrical bore of the said flow control member or slide block. The cylindrical body is provided with radial slots having reciprocably mounted therein an uneven number of vanes for pumping fluid. The vanes are laterally confined and guided by two flanges, one of which is integral with the cylindrical body, whereas the other flange is connected to the cylindrical body by bolts or screws because the casting of both flanges as an integral unit with the cylindrical body would make it impossible to provide the vane slots. This known structure has not been very successful when working under high pressure, since, due to such high pressure, the screws or bolts connecting one flange to the pump rotor tend to stretch and loosen and not only cause increased leakage and thereby a material decrease in the emciency of the pump but eventually break and damage the pump.

It has been suggested to the cylindrical body of the pump rotor instead of fastening the flange to the cylindrical body by screws or bolts. However, this method is likewise not satisfactory, since the local heat treatment inherent to welding causes distortion and misalignment to vital parts of the pump rotor.

It is, therefore, an object of this invention to provide an improved method of making a vane pump rotor which will overcome the above mentioned drawbacks inherent to the vane pump rotors heretofore known.

It is another object to provide rotor which, when completed, integral unit.

It is a further object of this invention to provide a vane pump rotor which is composed of a plurality of parts adapted to be accurately finished individually and to be so connected as to form an integral unit.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

Figure 1 is a section through a vane pump with a pump rotor according to a first embodiment of the invention.

Figure 2 shows the vane pump rotor of Figure l on a somewhat larger scale,

a vane pump constitutes a single invention.

Figure 6 is an exploded viewof Figure 5 Figure 7 is a section along the line l--l of Figure 5.

Figure 8 is a perspective front view of an element forming a part of the vane pump rotor.

weld the flange to Figure 9 illustrates the broaching of the vane slots.

Figure 10 shows a invention.

Figure 11 is an exploded view of Figure 10.

Figure 12 is a section along the line i2-l2 of Figure 10.

Figure 13 illustrates two cooperating elements of the vane pump rotor.

Referring now to the drawings in detail and third embodiment of the Figure 1 thereof in particular, the vane pump illustrated therein comprises a pump casing l having passageways 2 and 3 therethrough serving selectively as inlet and outlet channels.

Slidably mounted in the casing l and guided by guiding surfaces 6 and t is a flow control memher 6. This member 6 has a cylindrical bore 1 cooperating with vanes 8 slidably mounted in the pump rotor 9. The member 6 is provided with passageways l0 and M respectively communicating with the passageways 2 and 3.

The pump rotor shaft 9 is journalled in the casing l by means of anti-friction bearings l2 and i3 and has mounted in oneend thereof a driving shaft l 4, which is rigidly connected to the rotor 9 so asto rotate therewith. The driving shaft M is hollow and has mounted therein a continuously urged toward pump casing.

The conical shaft l6 engages the inner edges of the vanes 3, said edges being formed in agreement with the taper of the conically shaped outer surface of the pin it. By adjusting the screw ll, the vanes 8 can be adjusted in radial direction.

As to the detailed construction of the pump rccent the ends thereof.

. ends of these segments have tongues 39 tor 8, thisconstructlon is illustrated in Figures 2, 3 and 4. As will be seen therefrom, the pump rotor 9 consists of a central hollow sleeve 2| with a hub 22. The hub 22 contains the vane slots 23 which are preferably milled therein by a cutter 24. The sleeve 2| also comprises a groove 25 on the inside thereof for receiving brazing material for the brazing operation later referred to.

After the sleeve 2| has been completely machined, the flanges 26 and 21 are mounted on the ends of the sleeve 2| so that they abut the adjacent portions of the hub 22. Thereupon, the driving shaft I4 is inserted into the interior of the sleeve 2| so that the groove 25 surrounds a portion of the shaft l4. After all parts have thus been assembled, they are rigidly connected to each other so as to form a single integral unit. This is done in a brazing furnace by the brazing operation known per se.

According to this operation, the assembly is furnace-brazed at a high temperature, in the neighborhood of 2200 F., and immediately moves to a cooling furnace, the temperature of which is suitable for hardening purposes. When the assembly is removed from this last mentioned furnace, it is quenched.

Referring to Figures to 9, illustrating another embodiment of the pump rotor according to the invention, the pump rotor shown in these drawings and generally designated 28, comprises a central member 29 with flanges 30 and 3| adja- The vane slots 32 are broached therein as illustrated in Figure 9. The end portions of the central member 29 are engaged by slotted sleeves 33, 34. One of the sleeves, namely sleeve 33, has mounted therein the driving shaft 35, as indicated in Figure 5.

When the elements have been assembled as shown in Figure 5, they are interconnected by brazing in a brazing furnace. In this way, the rotor elements form a single integral unit. Inasmuch as, in the first and second embodiments "of the invention, described above, the elements are machined separately, accurate machining of all parts and particularly of the vane slots can be carried out without difficulties, thereby obtaining great efficiency of is in operation.

Referring now to the third embodiment shown in Figures to 13, the vane rotor shown therein and generally designated 36, differs from the second embodiment, just described, primarily in that the central member 31 is built up of a plurality of-in the illustrated drawing seven-wedgeshaped elements or segments 38. The sides of these segments are milled to form slots for the vanes when the segments are assembled. The

for locating them in the assembly. These tongues fit into radial grooves 40 in the flanged faces of a pair of hubs 4|, 42.

Both of the hubs 4| and 42 are counter-bored from the side which has the radial groove 40 to receive rings 43 and 44. These rings provide a shoulder for locating the segments 38 in a radial direction. While such a shoulder might be provided on the hubs 4| and 42, the said shoulder would interfere with the straight-through milling of the grooves.

The flanges 45, 46 on the rotor, which form the end walls for the vanes, are made up of a pair of relatively large discs bored to fit the largest diameter of the hubs 4| and 42. These flanges are the last pieces to be assembled, their bores serving to lock the segments 38 in place against the rings 43 and 44 by fitting over the tops 75 cal the rotor when the latter r shoulders, respectively,

of the tongues 39. The upper portion of the segments 38 provide spaced shoulders for the flanges 45, 46. When the elements just referred to have been machined and assembled in the manner shown in Figure 10, the assembly is ready for the brazing and heat treating operation.

It will be understood that we desire to comprehend within our invention such modifications as come within the scope of the claims and the invention.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a rotor for vane pumps, a hollow sleeve having an integral enlarged hub centrally of said sleeve, there being slots through said sleeve and hub radially thereof, said slots being formed to receive and guide the pump varies, and cylindrical flange elements fitting over said sleeve and abutting opposite ends of said hub respectively, each flange element being substantially greater in diameter than said hub and adapted to abut said vanes throughout their radial range of operation, said flanges and said hub being integrally united into a rigid unit.

2. In a rotor for vane pumps, a hollow sleeve, including a hub of larger diameter than said sleeve and integral with said sleeve and forming therewith a pair of axially spaced shoulders, there being a plurality of slots through said sleeve and hub radially thereof, each slot being substantially coextensive with said hub in an axial direction, flange elements having central apertures fitting said sleeve and abutting said said sleeve and flange elements bein united into a rigid integral unit.

3. In a rotor for vane pumps, a sleeve having a hub integral therewith, said hub being of larger diameter than said sleeve and being located to form with said sleeve two shoulders separated by a distance substantially equal to the width of said vanes, slots through said sleeve and hub radially thereof, the vanes of the pump being slidably fitted in said slots, cylindrical end flanges of greater diameter than said hub, having cen tral openings fitting said sleeve, said flanges and sleeve being integrally united with said flanges abutting respective shoulders thereby to slidably engage said vanes throughout their radial range of operation.

4. In a rotor for vane pumps, a sleeve having a hub integral therewith, said hub being of larger diameter than said sleeve and being so located thereon as to form with said sleeve two shoulders spaced apart a distance substantially equal to the width of said vanes, axial slots through said sleeve and said hub substantially radially thereof, the vanes of the pump being adapted slidably to fit said slots, cylindrical end flanges of greater diameter than said hub having central openings therein for receiving said sleeve, a drive shaft having one end shaped to fit within said sleeve, said sleeve, said flanges and said drive shaft being integrally united to form a rigid unitary rotor structure.

5. In a rotor for vane pumps, a hollow sleeve having a hub integral therewith, said hub being of larger diameter than said sleeve and being so located thereon as to form with said sleeve two shoulders spaced apart a distance substantially equal to the width of the pump vanes, axial slots through said sleeve and said hub substantially radially thereof, the vanes of the pump being adapted slidably to fit said slots, cylindriend flanges of greater diameter than said 5 hub having central 0961111188 therein for receivin: said sleeve, a drive shaft having one end shaped to fit within said sleeve, said sleeve, said flanges and Said drive shaft being united to form a rigid unitary rotor structure, a tapered pin axially shiftable within said sleeve, said pin being adapted for engagement with the inner edges of said vanes, and means carried by said rotor for engaging and axially shitting said pin so as to radially adjust said vanes.

GEORGE A. WALDIE.

JOHAN A, MULLER.

REFERENCES CITED The following references are oi record in the file of this mtent:

Bate Adaiicourt Sept; 22, 1863 Number Name Number Number 

